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TO ALL WI-IOM IT MAY CONCERN:

Be it known that I, GEORGE II. SANBORN, of Boston, in the State of Massachusetts, have invented an improved Paper-Cutting Machine; and Ido hereby declare the following to be a full and correct description of the same, reference being had'to the accompanying drawings, in which v Figure 1 is a perspective view of the machine complete.

Figure 2 is a diagram on a larger scale, illustrating the mode of operating the clutch by t-hc hand-lever and treadle.

Figure 3 is n similar diagram, showing the automatic mechanism for operating the clutch.

The same letter indicates the same part wherever it occurs.

This invention relates to that class of paper-cutting machines in which .the knife is hung on oscillating parallel bars, and gives a sliding or draw cut as it descends towards the table. It consists in a new mode of operating the knife; in theapplication of a movable index and graduated scale, to measure accurately the movements ofthe gauge; and in the arrangement of mechanism for imparting tothe knife a more rapid motion on its upward than it has en its downward stroke, 'all as hereinafter more particularly set forth To enable others to make and use my improved cutting-machine, I will proceed to describe its construction vand operation, referring to the drawings, by the letters of reference marked thereon.

A marks a stout frame of iron, to which the operative parts are attached. B is a winch attached to the pinion C, which meshes into the gear-wheel D on the end of the main shaft E. On shaft E is a. small bevelled which are so constructed as to engage with clutch L when its jaws are brought into contact with them. L is ai double clutch, with jaws on both faces, made to it corresponding jaws on the pinion I and wheel K. It traverses longitudinally on shaft H, and rotates with it, being attached to it by means of a groove sliding on a feather on the shaft. A groove on the periphery of the clutch receives 'a pin, d, attached to slide M, so that the longitudinal movement of that slide imparts a similar movement to the clutch, and causes it to engage either the pinion I or wheel K, according to the direction in'whieh it is impelled by slide M. This slide has a reeiprocat- "y ing movement in the direction of its lengtl1, and can be operated either by the hand-lever N, the treadle S, or f the rock-'shaft S. The leve N has its fulcrum at a, and is connected with slide M by link P and the pins b c. The treadle S is connected w'ithv the slide M by rod R and bent lever Q, the last having its fulcrum at g, and `a. fork in-'its upper end, which receives the pin c, projecting from M. Pins, h and z', connect the rod R to lever Q and treadle S. The treadlc is pivoted to the frame A at l. The hand-lever Nis used to throw the clutch into gear tostart the machine. `The treadle is intended to stop the machine at any moment by throwing the clutch out of gear with the pinionI or wheel K.

During the regular operation of the machine, the clutch is operated automatically by the mechanism now to be described. On 'the crank-shaft U (figs. 1 and 3,) is a disk, V, from the periphery of which projects a pin, m, which, as the disk revolves, engages alternately with the cams a andp on rock-shaft S', `and imparts a rock ing motion to that shaft. At one end of that shaft projects an arm, carrying a weight, W', which gives momcntum to the movements of the shaft, and causes it to obey promptly and energetically the impulse of the pin m, imparted to the cams up. On the opposite end of shaft S is an'arm, a', having a fork in its extremity, which engages pin `)"on slide M. By reason of this connection the oscillation of shaft S imparts a. reciprocating movement to slide M, and causes the clutch L to engage alternately with ,pinion I and gear-wheel K, during each revolution of shaft U. Pinion I gears into the large gear-wheel W on shaft U, and wheel K gears into T wheel T, of equal size with itself, on shaft U. When pinion I is clutched to shaft II, it drives wheel W and its shaft U, at a speed much slower than its own, owing to the relative sizes of the wheel and pinion; but when wheel K is clutched to shaft H, it becomes the driving-wheel, and, by means of wheel T, drives shaft U at a much greater speed than it received from pinion I and wheel W. The slow movement of shaft U is intended to be applied during that portion of its revolution which effects the descent of the knife, and the more rapid movement during that portion which raises thc knife for a repetition of the cut. On the forward end of. shaft U is crank X (figs. 1 and 3,) connected bypitman Y with the knife-stock Z, which is hung on parallel rods, A A', and swings between suitable guides catho frame. The knife kis attached toits lower edge.- 'lhus the pinion, F, gearing into bcvelled wheel G, on the front end of shaft H, which runs at right angles to the main j shaft, towards the rear of the machine. On this shaft are the loose pinion I and the loose wheel K, both of operation of.the knife is e'ected by the rotation of the crank-shaft C is a sliding clamp operated by the wheel D in the usual nianner, to hold the-paper firmly while under the operation of the knife. G is a sliding gauge, whichris moved backwards and forwards on the table T by means of a screw, g, which runs through an arm of G', projecting downward through 'a slot, v, in the table. This screw is operated by the wheel H', and draws the gauge to or from the knife 7c. Attached to the arm of gaug'G, under the table, isa rod, 1', having an index, t, which slides along a graduated scale, s, as the gauge is moved back and forth. By means of wheel f VHg', and the scale and index, the position of the gauge can be adjusted with perfect accuracy. i

The operation of the machine is as follows: The knife being downin contact with the table, and motion being given to the main shaft E in any suitable manner, the operator, by means ofthe hand-leven,` N, throws the clutch L into gear' with Wheel K, which, .in the manner before explained, imparts rapid revolution to shaft U, and raises the knife k quickly to the top of its stroke. At that point the arm a' of shaft S4 is moved by the action of the appropriate cam, so as to throw the clutch L into geai` with pinion I, which, as before explained, imparts a slow movement to shaft U, and brings the knife, by a slow A draw cut, down upon the table, severing any paper that may be placed under it, along a line determined bythe previous adjustment of the gauge. The arm a again shifts the slide M, so as to Athrow clutch L into'gear with wheel K, and raises the knife by a lquick motion to the top of its stroke, ready for a repetition of the operation. The operation can i be arrested at any time, by means of the treadle S or hand-lever N.

Having thus fully described my invention', whatI claim, and desire to secure-by Letters Patent, is-

1. Operating the knife-by connecting it with the crankX,yin the manner described.

2. -In a paper-cutting machine, the combination, with the gauge, of rod 1', index t, and' graduated scale s, in the manner and for the purpose set forth. y

3. The arrangement. of gearing herein described, for regulating the speed of the knife, giving ita slow movement on its downward stroke, and a quick movement on itsl upward stroke, as set forth.

The above speccation of my said invention signed and witnessed at Boston, this 18th day of September, A. D. 1867.

GEORGE H. SANBORN.

Witnesses: Y, WILLIAM C. CLEVELAND, -W-"`-""`" CHAS. F. S'rANsBURY. 

